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The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton

文献类型：期刊论文

作者Kong, Juanjuan3,4,5; Niu, Yaoling1,2,4,5; Duan, Meng1; Shao, Fengli3,4,5; Xiao, Yuanyuan4,5; Zhang, Yu4; Guo, Pengyuan4,5; Sun, Pu3,4,5; Gong, Hongmei4,5
刊名GEOLOGICAL JOURNAL
出版日期2019-11-01
卷号54期号:6页码:4014-4033
关键词continental collision Jiaochangba granitoids lower crust melting petrogenesis West Qinling
ISSN号0072-1050
DOI10.1002/gj.3368
通讯作者Kong, Juanjuan(juanjuan0317@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
英文摘要The West Qinling Orogenic Belt (WQOB) is a major portion of the Qinling-Dabie-Sulu Orogen and holds essential information for understanding the protracted evolution of the north-eastern branch of the Paleo-Tethys in East Asia. In this study, we report our petrological, geochemical, and geochronological study on the five Triassic granitoid plutons of West Qinling with emphasis on the poorly studied Jiaochangba pluton with zircon U-Pb ages of 217.5 +/- 1.6 Ma and 215.2 +/- 1.2 Ma. The new data and the existing data on the other four plutons support the view that the West Qinling granitoids represent a magmatic response to the continental collision of the Yangtze Block (YB) with the North China Craton (NCC) in the Triassic. Like the other four plutons, the Jiaochangba pluton shows strong light rare earth element (REE) enrichment and weak heavy REE depletion ([La/Sm](N) approximate to 7.14 +/- 1.89; [Sm/Yb](N) approximate to 4.63 +/- 1.85) with varying negative Eu anomalies (Eu/Eu* approximate to 0.65 +/- 0.20). In the N-MORB normalized diagram, all the samples show relative enrichment in Rb, Pb, U, and K with negative Nb, Ta, P, and Ti anomalies, resembling those of the model continental crust. The Jiaochangba pluton has relatively lower (Sr-87/Sr-86)(i) (0.7062 to 0.7081), higher epsilon(Nd)(t) (-6.91 to -2.09), and epsilon(Hf)(t) (-5.57 to -0.14) than mature continental crust, which are consistent with their source being dominated by lower crust with significant mantle contributions. Mantle-derived melt, which formed from partial melting of mantle wedge peridotite facilitated by dehydration of the subducted/subducting Mianlue ocean crust, provide the required heat for the crustal melting while also contributing to the compositions of these granitoids. Evolution of such parental magmas in open system crustal magma chambers with continued evolution/replenishment and crustal contamination and assimilation give rise to the observed petrological and geochemical characteristics of these granitoids.
资助项目Qingdao National Laboratory[U1606401] ; Qingdao National Laboratory[2015ASKJ03] ; NSFC[41130314] ; NSFC[41630968]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496020400044
出版者WILEY
源URL[http://ir.qdio.ac.cn/handle/337002/164823]  
专题中国科学院海洋研究所
通讯作者Kong, Juanjuan; Niu, Yaoling
作者单位1.China Univ Geosci, Sch Earth Sci & Resources, Beijing, Peoples R China
2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Shandong, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式
GB/T 7714		 Kong, Juanjuan,Niu, Yaoling,Duan, Meng,et al. The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton[J]. GEOLOGICAL JOURNAL,2019,54(6):4014-4033.
APA Kong, Juanjuan.,Niu, Yaoling.,Duan, Meng.,Shao, Fengli.,Xiao, Yuanyuan.,...&Gong, Hongmei.(2019).The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton.GEOLOGICAL JOURNAL,54(6),4014-4033.
MLA Kong, Juanjuan,et al."The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton".GEOLOGICAL JOURNAL 54.6(2019):4014-4033.

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来源：海洋研究所

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